Sheet-metal-punching device.



No. 794,476; PATENTED JULY 11, 1905. J. WILDBRMAN.

I SHEET METAL PUNO'HING DEVICE.

APPLIUATION FILED JAN. 30, 1905.

WITNE88E8:

NITED STATES Patented July 11, 1905 PATENT OFFICE.

SHEET-METAL-PUNCHING DEVICE.

SPECIFICATION forming part of Letters Patent No. 794,476, dated July 11, 1905. Application file January 30, 1905. Serial No. 243,428.

To all whom it may concern:

Be it known that I, JOHN WILDERMAN, a citizen of the United States, residing at San Francisco, in the county of San Francisco and State of California, have invented certain new and useful Improvements in Sheet-Metal- Punching Devices; and I do hereby declare the following to be a full, clear, and exact description of the same, such as will enable others skilled in the art to which it appertains'to make and use the same.

My present invention is a sheetmetalpunching device, which, as the name indicates, is a device for punching holes through sheet metal.

The prime object of my present invention is to assemble a comparatively few parts in such a manner as to be capable of exerting a comparatively great force on the reciprocating punch.

The device possesses all the requisites of strength and durability and is especially simple in construction and eificient in operation.

The parts are so assembled as to be positive in their action and free from any liability of derangement.

Other objects and advantages of the invention will appear to those familiar with this class of devices as the following specification is gone over in conjunction with the accompanying drawings, in which- Figure 1 is a central longitudinal vertical section of the punch, showing the relative arrangement of the interior operative parts. Fig. 2 is a side elevation of the complete device, the scale being one-half of that shown in Fig. 1. I

Referring now to the above views by letter, A and B representtwo opposite handles, which are pivoted between opposite twin plates C by means of the small pivots a and b. The inner extremities of the handles A and B are formed with the gear-shaped teeth A and B,

respectively, which are formed on an arc of which the pivots a and Z) are centers.

Interposed between the teeth of the handles A and B and formed to mesh with the teeth A and B thereof is the reciprocating block D. This block D is guided between opposite faces of the crossrib E and bears a suitable punch F. In order to provide means for accommodating various sizes of punches, I removably hold the punch F in block D by means of a small cross-pin f.

In order to receive the punch F, I have arranged the die Gr, which is held in a removable-block H. It will be readily seen that by loosening the set-screw h this block H can be drawn out and a new die of any proper size can be inserted.

Now assuming that the jaws areheld in the relative positions shown in Fig. 1 by means of the helical spring J, whose outer end hooks into a small hook on handle B, it will be readily seen that as the handles are brought together in the position shown in Fig. 2 the punch F will descend vertically and readily punch through the sheet of metal placed between the punch and die in the space K. As the handles are released they will assume the normal position shown in Fig. 1.

From the above description it will be readily seen that I have provided a very simple, durable, and compact device and one in which great power is exerted on the punch. It is further manifest that in order to punch a hole at any particular point it is necessary to observe that point until the punch is firmly set down. I accomplish this end by simply observing the reverse side of the plate through the opening M.

Having thus fully described my invention, what I claim, and desire to secure by Letters Patent, is-

1. A punching device provided with opposite pivoted jaws, gear-teeth cut in said jaws, and a movable block interposed between said jaws and engaged by said teeth, a punch removably held in said block, a suitable body to which said jaws are pivoted, and adie removably held in said body and in line with said punch, substantially as and for the purpose set forth.

2. A device of the class described consisting of a suitable body, opposite jaws pivoted to said body and formed with gear-shaped teeth, asliding block interposed between said jaws and meshing with the teeth thereof, a removable block held in said body and a die removably held in said removable block, and a helical spring carried by said body and engaging one of said jaws.

In testimony whereof I have signed my name to this specification in the presence of two sub- 10 I scribing witnesses.

JOHN WILDERMAN.

Witnesses:

GEORGE PATTISON, ORPHA G. PooR. 

